drivers/scsi/arm/powertec.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  *  linux/drivers/acorn/scsi/powertec.c
   4  *
   5  *  Copyright (C) 1997-2005 Russell King
   6  */
   7 #include <linux/module.h>
   8 #include <linux/blkdev.h>
   9 #include <linux/kernel.h>
  10 #include <linux/string.h>
  11 #include <linux/ioport.h>
  12 #include <linux/proc_fs.h>
  13 #include <linux/delay.h>
  14 #include <linux/interrupt.h>
  15 #include <linux/init.h>
  16 #include <linux/dma-mapping.h>
  17 #include <linux/pgtable.h>
  18
  19 #include <asm/dma.h>
  20 #include <asm/ecard.h>
  21 #include <asm/io.h>
  22
  23 #include "../scsi.h"
  24 #include <scsi/scsi_host.h>
  25 #include "fas216.h"
  26 #include "scsi.h"
  27
  28 #include <scsi/scsicam.h>
  29
  30 #define POWERTEC_FAS216_OFFSET  0x3000
  31 #define POWERTEC_FAS216_SHIFT   6
  32
  33 #define POWERTEC_INTR_STATUS    0x2000
  34 #define POWERTEC_INTR_BIT       0x80
  35
  36 #define POWERTEC_RESET_CONTROL  0x1018
  37 #define POWERTEC_RESET_BIT      1
  38
  39 #define POWERTEC_TERM_CONTROL   0x2018
  40 #define POWERTEC_TERM_ENABLE    1
  41
  42 #define POWERTEC_INTR_CONTROL   0x101c
  43 #define POWERTEC_INTR_ENABLE    1
  44 #define POWERTEC_INTR_DISABLE   0
  45
  46 #define VERSION "1.10 (19/01/2003 2.5.59)"
  47
  48 /*
  49  * Use term=0,1,0,0,0 to turn terminators on/off.
  50  * One entry per slot.
  51  */
  52 static int term[MAX_ECARDS] = { 1, 1, 1, 1, 1, 1, 1, 1 };
  53
  54 #define NR_SG   256
  55
  56 struct powertec_info {
  57         FAS216_Info             info;
  58         struct expansion_card   *ec;
  59         void __iomem            *base;
  60         unsigned int            term_ctl;
  61         struct scatterlist      sg[NR_SG];
  62 };
  63
  64 /* Prototype: void powertecscsi_irqenable(ec, irqnr)
  65  * Purpose  : Enable interrupts on Powertec SCSI card
  66  * Params   : ec    - expansion card structure
  67  *          : irqnr - interrupt number
  68  */
  69 static void
  70 powertecscsi_irqenable(struct expansion_card *ec, int irqnr)
  71 {
  72         struct powertec_info *info = ec->irq_data;
  73         writeb(POWERTEC_INTR_ENABLE, info->base + POWERTEC_INTR_CONTROL);
  74 }
  75
  76 /* Prototype: void powertecscsi_irqdisable(ec, irqnr)
  77  * Purpose  : Disable interrupts on Powertec SCSI card
  78  * Params   : ec    - expansion card structure
  79  *          : irqnr - interrupt number
  80  */
  81 static void
  82 powertecscsi_irqdisable(struct expansion_card *ec, int irqnr)
  83 {
  84         struct powertec_info *info = ec->irq_data;
  85         writeb(POWERTEC_INTR_DISABLE, info->base + POWERTEC_INTR_CONTROL);
  86 }
  87
  88 static const expansioncard_ops_t powertecscsi_ops = {
  89         .irqenable      = powertecscsi_irqenable,
  90         .irqdisable     = powertecscsi_irqdisable,
  91 };
  92
  93 /* Prototype: void powertecscsi_terminator_ctl(host, on_off)
  94  * Purpose  : Turn the Powertec SCSI terminators on or off
  95  * Params   : host   - card to turn on/off
  96  *          : on_off - !0 to turn on, 0 to turn off
  97  */
  98 static void
  99 powertecscsi_terminator_ctl(struct Scsi_Host *host, int on_off)
 100 {
 101         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 102
 103         info->term_ctl = on_off ? POWERTEC_TERM_ENABLE : 0;
 104         writeb(info->term_ctl, info->base + POWERTEC_TERM_CONTROL);
 105 }
 106
 107 /* Prototype: void powertecscsi_intr(irq, *dev_id, *regs)
 108  * Purpose  : handle interrupts from Powertec SCSI card
 109  * Params   : irq    - interrupt number
 110  *            dev_id - user-defined (Scsi_Host structure)
 111  */
 112 static irqreturn_t powertecscsi_intr(int irq, void *dev_id)
 113 {
 114         struct powertec_info *info = dev_id;
 115
 116         return fas216_intr(&info->info);
 117 }
 118
 119 /* Prototype: fasdmatype_t powertecscsi_dma_setup(host, SCpnt, direction, min_type)
 120  * Purpose  : initialises DMA/PIO
 121  * Params   : host      - host
 122  *            SCpnt     - command
 123  *            direction - DMA on to/off of card
 124  *            min_type  - minimum DMA support that we must have for this transfer
 125  * Returns  : type of transfer to be performed
 126  */
 127 static fasdmatype_t
 128 powertecscsi_dma_setup(struct Scsi_Host *host, struct scsi_pointer *SCp,
 129                        fasdmadir_t direction, fasdmatype_t min_type)
 130 {
 131         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 132         struct device *dev = scsi_get_device(host);
 133         int dmach = info->info.scsi.dma;
 134
 135         if (info->info.ifcfg.capabilities & FASCAP_DMA &&
 136             min_type == fasdma_real_all) {
 137                 int bufs, map_dir, dma_dir;
 138
 139                 bufs = copy_SCp_to_sg(&info->sg[0], SCp, NR_SG);
 140
 141                 if (direction == DMA_OUT) {
 142                         map_dir = DMA_TO_DEVICE;
 143                         dma_dir = DMA_MODE_WRITE;
 144                 } else {
 145                         map_dir = DMA_FROM_DEVICE;
 146                         dma_dir = DMA_MODE_READ;
 147                 }
 148
 149                 dma_map_sg(dev, info->sg, bufs, map_dir);
 150
 151                 disable_dma(dmach);
 152                 set_dma_sg(dmach, info->sg, bufs);
 153                 set_dma_mode(dmach, dma_dir);
 154                 enable_dma(dmach);
 155                 return fasdma_real_all;
 156         }
 157
 158         /*
 159          * If we're not doing DMA,
 160          *  we'll do slow PIO
 161          */
 162         return fasdma_pio;
 163 }
 164
 165 /* Prototype: int powertecscsi_dma_stop(host, SCpnt)
 166  * Purpose  : stops DMA/PIO
 167  * Params   : host  - host
 168  *            SCpnt - command
 169  */
 170 static void
 171 powertecscsi_dma_stop(struct Scsi_Host *host, struct scsi_pointer *SCp)
 172 {
 173         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 174         if (info->info.scsi.dma != NO_DMA)
 175                 disable_dma(info->info.scsi.dma);
 176 }
 177
 178 /* Prototype: const char *powertecscsi_info(struct Scsi_Host * host)
 179  * Purpose  : returns a descriptive string about this interface,
 180  * Params   : host - driver host structure to return info for.
 181  * Returns  : pointer to a static buffer containing null terminated string.
 182  */
 183 const char *powertecscsi_info(struct Scsi_Host *host)
 184 {
 185         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 186         static char string[150];
 187
 188         sprintf(string, "%s (%s) in slot %d v%s terminators o%s",
 189                 host->hostt->name, info->info.scsi.type, info->ec->slot_no,
 190                 VERSION, info->term_ctl ? "n" : "ff");
 191
 192         return string;
 193 }
 194
 195 /* Prototype: int powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 196  * Purpose  : Set a driver specific function
 197  * Params   : host   - host to setup
 198  *          : buffer - buffer containing string describing operation
 199  *          : length - length of string
 200  * Returns  : -EINVAL, or 0
 201  */
 202 static int
 203 powertecscsi_set_proc_info(struct Scsi_Host *host, char *buffer, int length)
 204 {
 205         int ret = length;
 206
 207         if (length >= 12 && strncmp(buffer, "POWERTECSCSI", 12) == 0) {
 208                 buffer += 12;
 209                 length -= 12;
 210
 211                 if (length >= 5 && strncmp(buffer, "term=", 5) == 0) {
 212                         if (buffer[5] == '1')
 213                                 powertecscsi_terminator_ctl(host, 1);
 214                         else if (buffer[5] == '0')
 215                                 powertecscsi_terminator_ctl(host, 0);
 216                         else
 217                                 ret = -EINVAL;
 218                 } else
 219                         ret = -EINVAL;
 220         } else
 221                 ret = -EINVAL;
 222
 223         return ret;
 224 }
 225
 226 /* Prototype: int powertecscsi_proc_info(char *buffer, char **start, off_t offset,
 227  *                                      int length, int host_no, int inout)
 228  * Purpose  : Return information about the driver to a user process accessing
 229  *            the /proc filesystem.
 230  * Params   : buffer  - a buffer to write information to
 231  *            start   - a pointer into this buffer set by this routine to the start
 232  *                      of the required information.
 233  *            offset  - offset into information that we have read up to.
 234  *            length  - length of buffer
 235  *            inout   - 0 for reading, 1 for writing.
 236  * Returns  : length of data written to buffer.
 237  */
 238 static int powertecscsi_show_info(struct seq_file *m, struct Scsi_Host *host)
 239 {
 240         struct powertec_info *info;
 241
 242         info = (struct powertec_info *)host->hostdata;
 243
 244         seq_printf(m, "PowerTec SCSI driver v%s\n", VERSION);
 245         fas216_print_host(&info->info, m);
 246         seq_printf(m, "Term    : o%s\n",
 247                         info->term_ctl ? "n" : "ff");
 248
 249         fas216_print_stats(&info->info, m);
 250         fas216_print_devices(&info->info, m);
 251         return 0;
 252 }
 253
 254 static ssize_t powertecscsi_show_term(struct device *dev, struct device_attribute *attr, char *buf)
 255 {
 256         struct expansion_card *ec = ECARD_DEV(dev);
 257         struct Scsi_Host *host = ecard_get_drvdata(ec);
 258         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 259
 260         return sprintf(buf, "%d\n", info->term_ctl ? 1 : 0);
 261 }
 262
 263 static ssize_t
 264 powertecscsi_store_term(struct device *dev, struct device_attribute *attr, const char *buf, size_t len)
 265 {
 266         struct expansion_card *ec = ECARD_DEV(dev);
 267         struct Scsi_Host *host = ecard_get_drvdata(ec);
 268
 269         if (len > 1)
 270                 powertecscsi_terminator_ctl(host, buf[0] != '0');
 271
 272         return len;
 273 }
 274
 275 static DEVICE_ATTR(bus_term, S_IRUGO | S_IWUSR,
 276                    powertecscsi_show_term, powertecscsi_store_term);
 277
 278 static struct scsi_host_template powertecscsi_template = {
 279         .module                         = THIS_MODULE,
 280         .show_info                      = powertecscsi_show_info,
 281         .write_info                     = powertecscsi_set_proc_info,
 282         .name                           = "PowerTec SCSI",
 283         .info                           = powertecscsi_info,
 284         .queuecommand                   = fas216_queue_command,
 285         .eh_host_reset_handler          = fas216_eh_host_reset,
 286         .eh_bus_reset_handler           = fas216_eh_bus_reset,
 287         .eh_device_reset_handler        = fas216_eh_device_reset,
 288         .eh_abort_handler               = fas216_eh_abort,
 289         .cmd_size                       = sizeof(struct fas216_cmd_priv),
 290         .can_queue                      = 8,
 291         .this_id                        = 7,
 292         .sg_tablesize                   = SG_MAX_SEGMENTS,
 293         .dma_boundary                   = IOMD_DMA_BOUNDARY,
 294         .cmd_per_lun                    = 2,
 295         .proc_name                      = "powertec",
 296 };
 297
 298 static int powertecscsi_probe(struct expansion_card *ec,
 299                               const struct ecard_id *id)
 300 {
 301         struct Scsi_Host *host;
 302         struct powertec_info *info;
 303         void __iomem *base;
 304         int ret;
 305
 306         ret = ecard_request_resources(ec);
 307         if (ret)
 308                 goto out;
 309
 310         base = ecardm_iomap(ec, ECARD_RES_IOCFAST, 0, 0);
 311         if (!base) {
 312                 ret = -ENOMEM;
 313                 goto out_region;
 314         }
 315
 316         host = scsi_host_alloc(&powertecscsi_template,
 317                                sizeof (struct powertec_info));
 318         if (!host) {
 319                 ret = -ENOMEM;
 320                 goto out_region;
 321         }
 322
 323         ecard_set_drvdata(ec, host);
 324
 325         info = (struct powertec_info *)host->hostdata;
 326         info->base = base;
 327         powertecscsi_terminator_ctl(host, term[ec->slot_no]);
 328
 329         info->ec = ec;
 330         info->info.scsi.io_base         = base + POWERTEC_FAS216_OFFSET;
 331         info->info.scsi.io_shift        = POWERTEC_FAS216_SHIFT;
 332         info->info.scsi.irq             = ec->irq;
 333         info->info.scsi.dma             = ec->dma;
 334         info->info.ifcfg.clockrate      = 40; /* MHz */
 335         info->info.ifcfg.select_timeout = 255;
 336         info->info.ifcfg.asyncperiod    = 200; /* ns */
 337         info->info.ifcfg.sync_max_depth = 7;
 338         info->info.ifcfg.cntl3          = CNTL3_BS8 | CNTL3_FASTSCSI | CNTL3_FASTCLK;
 339         info->info.ifcfg.disconnect_ok  = 1;
 340         info->info.ifcfg.wide_max_size  = 0;
 341         info->info.ifcfg.capabilities   = 0;
 342         info->info.dma.setup            = powertecscsi_dma_setup;
 343         info->info.dma.pseudo           = NULL;
 344         info->info.dma.stop             = powertecscsi_dma_stop;
 345
 346         ec->irqaddr     = base + POWERTEC_INTR_STATUS;
 347         ec->irqmask     = POWERTEC_INTR_BIT;
 348
 349         ecard_setirq(ec, &powertecscsi_ops, info);
 350
 351         device_create_file(&ec->dev, &dev_attr_bus_term);
 352
 353         ret = fas216_init(host);
 354         if (ret)
 355                 goto out_free;
 356
 357         ret = request_irq(ec->irq, powertecscsi_intr,
 358                           0, "powertec", info);
 359         if (ret) {
 360                 printk("scsi%d: IRQ%d not free: %d\n",
 361                        host->host_no, ec->irq, ret);
 362                 goto out_release;
 363         }
 364
 365         if (info->info.scsi.dma != NO_DMA) {
 366                 if (request_dma(info->info.scsi.dma, "powertec")) {
 367                         printk("scsi%d: DMA%d not free, using PIO\n",
 368                                host->host_no, info->info.scsi.dma);
 369                         info->info.scsi.dma = NO_DMA;
 370                 } else {
 371                         set_dma_speed(info->info.scsi.dma, 180);
 372                         info->info.ifcfg.capabilities |= FASCAP_DMA;
 373                 }
 374         }
 375
 376         ret = fas216_add(host, &ec->dev);
 377         if (ret == 0)
 378                 goto out;
 379
 380         if (info->info.scsi.dma != NO_DMA)
 381                 free_dma(info->info.scsi.dma);
 382         free_irq(ec->irq, info);
 383
 384  out_release:
 385         fas216_release(host);
 386
 387  out_free:
 388         device_remove_file(&ec->dev, &dev_attr_bus_term);
 389         scsi_host_put(host);
 390
 391  out_region:
 392         ecard_release_resources(ec);
 393
 394  out:
 395         return ret;
 396 }
 397
 398 static void powertecscsi_remove(struct expansion_card *ec)
 399 {
 400         struct Scsi_Host *host = ecard_get_drvdata(ec);
 401         struct powertec_info *info = (struct powertec_info *)host->hostdata;
 402
 403         ecard_set_drvdata(ec, NULL);
 404         fas216_remove(host);
 405
 406         device_remove_file(&ec->dev, &dev_attr_bus_term);
 407
 408         if (info->info.scsi.dma != NO_DMA)
 409                 free_dma(info->info.scsi.dma);
 410         free_irq(ec->irq, info);
 411
 412         fas216_release(host);
 413         scsi_host_put(host);
 414         ecard_release_resources(ec);
 415 }
 416
 417 static const struct ecard_id powertecscsi_cids[] = {
 418         { MANU_ALSYSTEMS, PROD_ALSYS_SCSIATAPI },
 419         { 0xffff, 0xffff },
 420 };
 421
 422 static struct ecard_driver powertecscsi_driver = {
 423         .probe          = powertecscsi_probe,
 424         .remove         = powertecscsi_remove,
 425         .id_table       = powertecscsi_cids,
 426         .drv = {
 427                 .name           = "powertecscsi",
 428         },
 429 };
 430
 431 static int __init powertecscsi_init(void)
 432 {
 433         return ecard_register_driver(&powertecscsi_driver);
 434 }
 435
 436 static void __exit powertecscsi_exit(void)
 437 {
 438         ecard_remove_driver(&powertecscsi_driver);
 439 }
 440
 441 module_init(powertecscsi_init);
 442 module_exit(powertecscsi_exit);
 443
 444 MODULE_AUTHOR("Russell King");
 445 MODULE_DESCRIPTION("Powertec SCSI driver");
 446 module_param_array(term, int, NULL, 0);
 447 MODULE_PARM_DESC(term, "SCSI bus termination");
 448 MODULE_LICENSE("GPL");